OK so here it is. Have a 92 Xj sport with cracked block but still ran. Pulled a 4.0 motor from a 99 ish Zj which also still ran. Pulled the intake, exhaust and distributor off as well because that stuff would not match up. So what I have now is a 99 block and head and all internals ....with 92 distributor, intake and exhaust and all electronics. All went well till I tried to fire it up....nothing. try as I might. ...no mater how many times I set it to TDC and install the distributor at 5 o'clock I get nothing. 1 tooth forward or back and it sputters but that's it.

So my question is this...is the 99 internals that much different? Is the timing different? Can I even use this motor? Been at this for 2 months and about to set it on fire.....help please!

no I did not but I can if that is what I must do....so that said....your saying the cam inside must be different for it not to run which is why I would need the newer ecm and sensors to make it work? that could b a problem as the crank sensor in the 99 auto trans will not fit the 5speed in the 92....I was hoping to avoid rewiring the whole damn thing....oh well...if I must I must...thx

By no means am I an electrical wizard....electrical dunce, more like it. But I remember when I was looking for an engine for 2002 WJ, I ran across material stating that I needed to find the same year engine, same flywheel tooth count, etc.

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